P. J. O'Mullan (born 1974) is an Irish hurling manager and former player.
Born in Loughguile, County Antrim, O'Mullan was introduced to hurling by his father, a long-serving selector and administrator with the local club team.
O'Mullan's senior club career coincided with a lean period for Loughgiel Shamrocks.
After being involved in team management and coaching in all grades at club level with Loughgiel Shamrocks, O'Mullan enjoyed his greatest successes at senior level.
O'Mullan enjoyed a brief but unsuccessful tenure as manager of the Antrim senior team.